UnitConvConvert
Pressure

Convert millimeters of mercury to inches of mercury

1 mmHg=0.03937inHg

Use the converter below to change any millimeters of mercury value into inches of mercury instantly — with formula, conversion table, and real-world examples.

0.03937

Conversion formula

Forward
inches of mercury = millimeters of mercury × 0.03937
Reverse
millimeters of mercury = inches of mercury × 25.4

Example: 10 mmHg × 0.03937 = 0.3937 inHg.

About both units

From

Millimeter of Mercury

mmHg

The millimetre of mercury equals about 133.3 Pa — the pressure exerted by a 1 mm column of mercury at 0 °C under standard gravity. Traditionally and still used in medicine: blood pressure of 120/80 mmHg.

Real-world: Normal blood pressure: 120/80 mmHg. Atmospheric: 760 mmHg. Good vacuum: <1 mmHg.
Read full millimeter of mercury reference →
To

Inch of Mercury

inHg

The inch of mercury equals about 3386 Pa. Used in US barometers, US aviation altimeter settings and some engineering. Standard sea-level pressure: 29.92 inHg.

Real-world: Sea-level standard: 29.92 inHg. Mountain pass at 3000 m: ~21 inHg. US aviation QNH given in inHg.
Read full inch of mercury reference →

Millimeter of Mercury to Inch of Mercury conversion table

Common millimeters of mercury to inches of mercury values for quick reference.

Millimeter of Mercury (mmHg)Inch of Mercury (inHg)
1 mmHg0.03937 inHg
5 mmHg0.1969 inHg
10 mmHg0.3937 inHg
25 mmHg0.9843 inHg
50 mmHg1.9685 inHg
100 mmHg3.93701 inHg
200 mmHg7.87401 inHg
500 mmHg19.685 inHg
1,000 mmHg39.3701 inHg
5,000 mmHg196.85 inHg

Tips & common mistakes

Quick tips

  • 1 mmHg ≈ 133.32 Pa ≈ 1 Torr.
  • 760 mmHg = 1 atm.
  • Blood-pressure cuffs display mmHg worldwide.

Avoid these

  • Confusing mmHg with mmH₂O (different unit, factor of 13.6).
  • Mixing mmHg with torr in precise vacuum physics — they differ by one part per million.
  • Writing blood pressure in kPa — use mmHg for medical continuity.

Frequently asked questions

How many inches of mercury in a millimeter of mercury?
One millimeter of mercury equals 0.03937 inches of mercury.
How do I convert millimeters of mercury to inches of mercury?
Multiply the millimeter of mercury value by 0.03937 to get the equivalent in inches of mercury.
What is 100 millimeters of mercury in inches of mercury?
100 millimeters of mercury equals 3.93701 inches of mercury.
Is a millimeter of mercury bigger than a inch of mercury?
No. 1 millimeter of mercury equals 0.03937 inches of mercury, so one millimeter of mercury is smaller.
How to convert millimeters of mercury to inches of mercury without a calculator?
Multiply by 0.04 for a quick estimate; use a calculator for precise results.

Related pressure conversions

📊 See full comparison matrix →

More from Millimeter of Mercury

mmHg → Pa
1 = 133.322 Pa
mmHg → kPa
1 = 0.1333 kPa
mmHg → MPa
1 = 0.0001333 MPa
mmHg → bar
1 = 0.001333 bar
mmHg → mbar
1 = 1.33322 mbar
mmHg → psi
1 = 0.01934 psi
mmHg → atm
1 = 0.001316 atm
mmHg → Torr
1 = 1 Torr

More to Inch of Mercury

Pa → inHg
1 = 0.0002953 inHg
kPa → inHg
1 = 0.2953 inHg
MPa → inHg
1 = 295.3 inHg
bar → inHg
1 = 29.53 inHg
mbar → inHg
1 = 0.02953 inHg
psi → inHg
1 = 2.03602 inHg
atm → inHg
1 = 29.9213 inHg
Torr → inHg
1 = 0.03937 inHg

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePowerKilowatt → Mechanical Horsepower